634
FNCA52 TJSJ 201930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST SUN SEP 20 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-210800-
SOUTHEAST COASTAL PLAINS-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 50 30
TEMP (24H TREND) 74 (-3) 90 (+1) 74 91
RH % (24H TREND) 93 (+4) 59 (-5) 94 60
WIND 20FT/EARLY(MPH) E 8 E 13 E 10 E 13
WIND 20FT/LATE(MPH) E 6 SE 13 NE 8 SE 13
MIXING HGT(FT-AGL/MSL) 4700 4950
TRANSPORT WND (MPH) E 12 E 13
VENT RATE (KT-FT) 47000 54450
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-210800-
SOUTHERN HILLS-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 50 20 50
TEMP (24H TREND) 71 (-3) 88 (+3) 71 89
RH % (24H TREND) 98 (+5) 63 (-4) 98 64
WIND 20FT/EARLY(MPH) E 5 E 10 E 6 E 11
WIND 20FT/LATE(MPH) E 5 SE 10 E 6 SE 11
MIXING HGT(FT-AGL/MSL) 5240 5440
TRANSPORT WND (MPH) E 10 E 10
VENT RATE (KT-FT) 47160 48960
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-210800-
NORTH COASTAL PLAINS-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 70 60 50
TEMP (24H TREND) 74 (-2) 91 (+1) 74 91
RH % (24H TREND) 99 (+5) 61 (-4) 100 61
WIND 20FT/EARLY(MPH) SE 10 E 10 SE 10 E 11
WIND 20FT/LATE(MPH) SE 6 E 14 SE 8 E 14
MIXING HGT(FT-AGL/MSL) 5000 5100
TRANSPORT WND (MPH) E 10 E 12
VENT RATE (KT-FT) 45000 51000
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-210800-
NORTHERN HILLS-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 90 60 60
TEMP (24H TREND) 71 (-2) 90 (+2) 71 90
RH % (24H TREND) 99 (+1) 63 (-3) 100 65
WIND 20FT/EARLY(MPH) SE 6 E 9 SE 5 E 9
WIND 20FT/LATE(MPH) LGT/VAR E 11 LGT/VAR E 11
MIXING HGT(FT-AGL/MSL) 5150 5530
TRANSPORT WND (MPH) SE 8 SE 8
VENT RATE (KT-FT) 36050 38710
DISPERSION 5 5
DSI 1 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-210800-
WEST COAST-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 60 40 80
TEMP (24H TREND) 73 (-2) 92 (+2) 73 92
RH % (24H TREND) 99 (+3) 63 (-3) 99 64
WIND 20FT/EARLY(MPH) E 8 SE 10 E 10 E 11
WIND 20FT/LATE(MPH) E 9 SE 12 E 9 E 12
MIXING HGT(FT-AGL/MSL) 4790 4790
TRANSPORT WND (MPH) SE 10 SE 9
VENT RATE (KT-FT) 43110 38320
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-210800-
EASTERN INTERIOR-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 20 40 40 60
TEMP (24H TREND) 72 (-4) 90 (+2) 72 90
RH % (24H TREND) 98 (+5) 61 (-3) 99 61
WIND 20FT/EARLY(MPH) SE 9 SE 9 SE 9 E 11
WIND 20FT/LATE(MPH) SE 8 SE 12 SE 9 SE 12
MIXING HGT(FT-AGL/MSL) 5740 6110
TRANSPORT WND (MPH) SE 10 SE 10
VENT RATE (KT-FT) 51660 54990
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-210800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 50 60 60
TEMP (24H TREND) 70 (-4) 86 (+3) 70 85
RH % (24H TREND) 99 (+4) 64 (-4) 100 65
WIND 20FT/EARLY(MPH) SE 6 SE 9 SE 8 E 10
WIND 20FT/LATE(MPH) SE 5 SE 10 E 6 SE 10
MIXING HGT(FT-AGL/MSL) 4680 4610
TRANSPORT WND (MPH) SE 12 SE 12
VENT RATE (KT-FT) 46800 46100
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-210800-
CENTRAL MOUNTAIN RANGE-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 90 40 80
TEMP (24H TREND) 68 (-4) 87 (+5) 68 87
RH % (24H TREND) 100 (+3) 68 (-5) 100 67
WIND 20FT/EARLY(MPH) SE 5 SE 6 SE 5 E 8
WIND 20FT/LATE(MPH) LGT/VAR SE 8 LGT/VAR E 8
MIXING HGT(FT-AGL/MSL) 5490 5940
TRANSPORT WND (MPH) SE 8 SE 8
VENT RATE (KT-FT) 38430 41580
DISPERSION 5 5
DSI 1 6 1 5
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-210800-
CAYEY MOUNTAIN RANGE-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 60 40
TEMP (24H TREND) 71 (-2) 85 (+2) 70 85
RH % (24H TREND) 98 (+2) 65 (-3) 100 67
WIND 20FT/EARLY(MPH) SE 5 SE 9 SE 6 E 9
WIND 20FT/LATE(MPH) LGT/VAR SE 9 E 5 SE 10
MIXING HGT(FT-AGL/MSL) 5180 5200
TRANSPORT WND (MPH) SE 10 E 10
VENT RATE (KT-FT) 46620 46800
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-210800-
VIEQUES-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 50 40
TEMP (24H TREND) 78 (-2) 90 (+1) 78 90
RH % (24H TREND) 84 (+3) 57 (-2) 85 57
WIND 20FT/EARLY(MPH) SE 9 SE 10 SE 10 E 11
WIND 20FT/LATE(MPH) SE 9 SE 10 E 10 E 10
MIXING HGT(FT-AGL/MSL) 3210 3530
TRANSPORT WND (MPH) SE 9 E 13
VENT RATE (KT-FT) 25680 38830
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-210800-
CULEBRA-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 50 40
TEMP (24H TREND) 79 (-2) 91 (+2) 79 91
RH % (24H TREND) 85 (+5) 57 (-6) 86 58
WIND 20FT/EARLY(MPH) E 9 SE 11 E 11 E 11
WIND 20FT/LATE(MPH) SE 9 SE 10 E 10 E 11
MIXING HGT(FT-AGL/MSL) 3290 3350
TRANSPORT WND (MPH) SE 9 E 14
VENT RATE (KT-FT) 26320 40200
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-210800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 30 20 40
TEMP (24H TREND) 75 (-2) 92 (+2) 75 92
RH % (24H TREND) 94 (+6) 58 (-4) 94 58
WIND 20FT/EARLY(MPH) E 10 E 13 E 13 E 16
WIND 20FT/LATE(MPH) E 11 SE 17 E 11 SE 16
MIXING HGT(FT-AGL/MSL) 4940 5040
TRANSPORT WND (MPH) SE 16 E 16
VENT RATE (KT-FT) 69160 70560
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-210800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 30 50 30
TEMP (24H TREND) 77 (-3) 88 (+1) 77 88
RH % (24H TREND) 85 (+5) 61 (-4) 86 61
WIND 20FT/EARLY(MPH) E 9 SE 11 E 11 E 12
WIND 20FT/LATE(MPH) SE 9 SE 10 E 11 E 11
MIXING HGT(FT-AGL/MSL) 3320 3370
TRANSPORT WND (MPH) E 12 E 15
VENT RATE (KT-FT) 33200 43810
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-210800-
ST CROIX-
330 PM AST SUN SEP 20 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 30 30
TEMP (24H TREND) 78 (-2) 90 (+2) 78 90
RH % (24H TREND) 88 (+3) 62 (-3) 89 62
WIND 20FT/EARLY(MPH) SE 8 E 11 E 10 E 12
WIND 20FT/LATE(MPH) E 8 SE 10 E 11 E 12
MIXING HGT(FT-AGL/MSL) 4920 4870
TRANSPORT WND (MPH) SE 12 E 14
VENT RATE (KT-FT) 49200 58440
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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